Cordless curtain assembly

ABSTRACT

A cordless curtain assembly includes a curtain unit, a control unit, a fixed part, a movable part and an operation cord. The curtain is connected between the head box and a bottom bar. The user may pulls the bottom bar to operate the operation cord which is wrapped to the first and second pillars in the fixed part and the movable part. The movable part is moved and activates the spring to lift the curtain. When the user lifts the bottom bar, the spring force is release so that the movable part moves back to its initial position to let the operation cord to pull the curtain upward.

FIELD OF THE INVENTION

The present invention relates to a cordless curtain assembly, and moreparticularly, to a cordless curtain assembly using a spring to control amovable member to control the operation of the curtain.

BACKGROUND OF THE INVENTION

A conventional curtain assembly generally comprises a curtain, atransmission unit and a control cord, wherein the transmission unit islocated in the head box and connected with the control cord. When theuser pulls the cord, the curtain is moved upward or downward relative tothe operation of the transmission unit and the cord. However, theconventional curtain assembly involves a complicated structure. The cordis connected to the transmission unit so that if the user pulls the cordtoo hard or releases the cord too quickly, the curtain cannot beproperly positioned at the desired position. The user has to operate thecord to adjust the position of the curtain several times.

Besides, the cord is connected to the transmission unit and the curtainis moved according to the operation of the transmission unit and thecord. The connection between the transmission unit and the cord iscomplicated and the manufacturing cost is high.

The present invention intends to provide a curtain assembly which doesnot need the control cord and the complicated structure.

SUMMARY OF THE INVENTION

The present invention relates to a curtain assembly and comprises aspring having a first end and a second end which is fixed to a firstfixed member in the head box. A fixed part has a first passage definedtherein, and at least two first pillars, at least one fixed member andmultiple first columns are located in the first passage of the fixedpart. A movable part has a second passage defined therein, and at leasttwo second pillars located in the second passage. Multiple rollers arelocated at the periphery of the movable part. Multiple first fixedmembers are located in the movable part. The first end of the spring isconnected to one of the first fixed members. An operation cord iswrapped to the at least two first pillars via the first passage and theat least two second pillars via the second passage.

Alternatively, the present invention provides a cordless curtainassembly and comprises a curtain unit having a head box and a bottombar, and a curtain is connected between the head box and the bottom bar.The head box has a space defined therein and multiple holes are definedthrough the bottom of the space. A spring has a first end and a secondend which is fixed to a first fixed member in the head box. A fixed parthas a first passage defined therein, and at least two first pillars, atleast one fixed member and multiple first columns are located in thefirst passage of the fixed part. The fixed part is securely located inthe space and located in opposite to the first fixed member. A movablepart has a second passage defined therein, and at least two secondpillars are located in the second passage. Multiple rollers are locatedat the periphery of the movable part. Multiple first fixed members arelocated in the movable part which is movably located in the space of thehead box. The first end of the spring is connected to one of the firstfixed members. An operation cord is wrapped to the at least two firstpillars via the first passage and the at least two second pillars viathe second passage. Two ends of the operation cord extend through theholes of the head box and the curtain, and are fixed to the bottom bar.

Preferably, the curtain is window blinds.

Preferably, the curtain is a honeycomb curtain.

Preferably, the curtain is a foldable shade.

The primary object of the present invention is to provide a curtainassembly which does not need the control cable hanging outside of thecurtain, and the structure is simple.

The present invention will become more obvious from the followingdescription when taken in connection with the accompanying drawingswhich show, for purposes of illustration only, a preferred embodiment inaccordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view to show the curtain assembly of the presentinvention;

FIG. 2 is a top view to show the parts in the head box of the curtainassembly of the present invention, wherein the spring is not extended;

FIG. 3 is a side cross sectional view to show the curtain assemblywherein the curtain is located at the higher position;

FIG. 4 is a top view to show the parts in the head box of the curtainassembly of the present invention, wherein the spring is extended, and

FIG. 5 is a side cross sectional view to show the curtain assemblywherein the curtain is located at the lower position.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1 to 3, the curtain assembly of the present inventioncomprises a curtain unit 10 having a head box 11 and a bottom bar 12. Acurtain 13 is connected between the head box 11 and the bottom bar 12.The head box 11 has a space 110 defined therein and multiple holes 111are defined through the bottom of the space 110. The curtain is windowblinds, a honeycomb curtain or a foldable shade.

A spring 20 has a first end 21 and a second end 22 which is fixed to afirst fixed member 44 in the head box 11. A fixed part 30 has a firstpassage 31 defined therein, and at least two first pillars 310, at leastone fixed member and multiple first columns 312 are located in the firstpassage 31 of the fixed part 30. The fixed part 30 is securely locatedin the space 110 and located in opposite to the first fixed member 44.

A movable part 40 has a second passage 41 defined therein, and at leasttwo second pillars 410 are located in the second passage 41. Multiplerollers 42 are located at the periphery of the movable part 40. Multiplefirst fixed members 43 are located in the movable part 40. The movablepart 40 is movably located in the space 110 of the head box 11. Thefirst end 21 of the spring 20 is connected to one of the first fixedmembers 43.

An operation cord 50 is wrapped to the at least two first pillars 310via the first passage 31 and the at least two second pillars 410 via thesecond passage 41. The two ends of the operation cord 50 extend throughthe holes 111 of the head box 11 and the curtain 13, and are fixed tothe bottom bar 12.

As shown in FIGS. 1-5, the spring 20 and the fixed part 30 arerespectively and securely located in two ends of the space 110 of thehead box 11. The movable part 40 is movably located in the space 110 ofthe head box 11, and the rollers 42 contact the inside of the space 110.The first end 21 and the second end 22 of the spring 20 are respectivelyconnected to the second fixed member 43 in the movable part 40 and thefirst fixed member 44 in the head box 11. The operation cord 50 iswrapped to the at least two first pillars 310 via the first passage 31and the at least two second pillars 410 via the second passage 41. Thetwo ends of the operation cord 50 extend through the holes 111 of thehead box 11 and the curtain 13, and are fixed to the bottom bar 12.

When the user pulls the bottom bar 12 downward, the operation cable 50moves so as to extend the spring 20 to expand (lower) the curtain 13.When the user pushes the bottom bar 12 upward, the force of the spring20 releases and the spring 20 bounces to its initial status, and themovable part 40 is moved, so that the operation cable 50 lifts thecurtain 13.

The operation to the bottom bar 12 drives the operation cable 50 to movethe movable part 40 and the spring 20 is expanded or bounces to itsinitial status, such that the curtain 13 is lowered or lifted. Theoperation is easy and the structure is simple. The manufacturing cost istherefore reduced.

While we have shown and described the embodiment in accordance with thepresent invention, it should be clear to those skilled in the art thatfurther embodiments may be made without departing from the scope of thepresent invention.

What is claimed is:
 1. A curtain assembly comprising: a spring having afirst end and a second end which is fixed to a first fixed member in ahead box; a fixed part having a first passage defined therein, at leasttwo first pillars, at least one fixed member and multiple first columnslocated in the first passage of the fixed part; a movable part having asecond passage defined therein, at least two second pillars located inthe second passage, multiple rollers located at a periphery of themovable part, multiple first fixed members located in the movable part,the first end of the spring connected to one of the first fixed members,and an operation cord wrapped to the at least two first pillars via thefirst passage and the at least two second pillars via the secondpassage.
 2. A cordless curtain assembly comprising: a curtain unithaving a head box and a bottom bar, a curtain connected between the headbox and the bottom bar, the head box having a space defined therein andmultiple holes defined through a bottom of the space; a spring having afirst end and a second end which is fixed to a first fixed member in thehead box; a fixed part having a first passage defined therein, at leasttwo first pillars, at least one fixed member and multiple first columnslocated in the first passage of the fixed part, the fixed part beingsecurely located in the space and located in opposite to the first fixedmember; a movable part having a second passage defined therein, at leasttwo second pillars located in the second passage, multiple rollerslocated at a periphery of the movable part, multiple first fixed memberslocated in the movable part, the movable part movably located in thespace of the head box, the first end of the spring connected to one ofthe first fixed members, and an operation cord wrapped to the at leasttwo first pillars via the first passage and the at least two secondpillars via the second passage, two ends of the operation cord extendingthrough the holes of the head box and the curtain and being fixed to thebottom bar.
 3. The curtain assembly as claimed in claim 2, wherein thecurtain is window blinds.
 4. The curtain assembly as claimed in claim 2,wherein the curtain is a honeycomb curtain.
 5. The curtain assembly asclaimed in claim 2, wherein the curtain is a foldable shade.